renderer,config: add custom DRM modeline support (#2254)

This allows specifying custom display resolutions for the DRM backend.
This is useful for display overclocking, working around broken EDIDs,
etc. To use this feature, specify a modeline instead of a resolution
in the config, for example:

    monitor = DP-1, modeline 1071.101 3840 3848 3880 3920 2160 2263 2271 2277 +hsync -vsync, 0x0, 1

This example is a custom 3840x2160@120Hz mode with tightened timings.
I use it because the standard timings don't work with my monitor and GPU
combination (M28U with RX580).

The syntax is compatible with Sway and Xorg.

1 files changed, 14 insertions, 11 deletions

diff --git a/src/helpers/Monitor.hpp b/src/helpers/Monitor.hpp
index 1f41c691..28dad111 100644
--- a/src/helpers/Monitor.hpp
+++ b/src/helpers/Monitor.hpp
@@ -6,6 +6,7 @@
 #include <vector>
 #include <array>
 #include <memory>
+#include <xf86drmMode.h>
 #include "Timer.hpp"
 
 struct SMonitorRule;
@@ -15,21 +16,23 @@ class CMonitor {
     CMonitor();
     ~CMonitor();
 
-    Vector2D    vecPosition        = Vector2D(-1, -1); // means unset
-    Vector2D    vecSize            = Vector2D(0, 0);
-    Vector2D    vecPixelSize       = Vector2D(0, 0);
-    Vector2D    vecTransformedSize = Vector2D(0, 0);
+    Vector2D        vecPosition        = Vector2D(-1, -1); // means unset
+    Vector2D        vecSize            = Vector2D(0, 0);
+    Vector2D        vecPixelSize       = Vector2D(0, 0);
+    Vector2D        vecTransformedSize = Vector2D(0, 0);
 
-    bool        primary = false;
+    bool            primary = false;
 
-    uint64_t    ID              = -1;
-    int         activeWorkspace = -1;
-    float       scale           = 1;
+    uint64_t        ID              = -1;
+    int             activeWorkspace = -1;
+    float           scale           = 1;
 
-    std::string szName = "";
+    std::string     szName = "";
 
-    Vector2D    vecReservedTopLeft     = Vector2D(0, 0);
-    Vector2D    vecReservedBottomRight = Vector2D(0, 0);
+    Vector2D        vecReservedTopLeft     = Vector2D(0, 0);
+    Vector2D        vecReservedBottomRight = Vector2D(0, 0);
+
+    drmModeModeInfo customDrmMode = {};
 
     // WLR stuff
     wlr_damage_ring     damage;